Process for electrolytic pickling using nitric acid-free solutions
a technology of electrolysis and nitric acid, which is applied in the direction of crystal growth process, separation process, manufacturing tools, etc., can solve the problems of nitric acid replacement in electrolysis process applications typical of processes a) and c) and has not yet been solved, and nitric acid alone does not enable the same standards of surface roughness, opacity and surface quality
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To provide an example, an electrolytic pickling process according to the present invention will now be described for the treatment of a continuous strip of cold-rolled stainless steel sheet of the ferritic type (series 400) having a width of 1200 mm, previously treated with molten salts according to step A.1.
The electrolytic apparatus adopted is represented schematically in FIG. 1 as regards the essential structural elements and comprises a rectangular tank in which the useful path length of the strip in contact with the solution is 17.5 m.
FIG. 1 illustrates only the first basic electrolytic unit (module) supplied with electric current having an intensity of 3700 A. This is followed by a second, similar unit supplied with a 2100-A current.
In the diagram of FIG. 1, the first electrolytic region E.1 is represented, where the cathodic counter-electrode consists of a rectangular plate set beneath the strip, having the side parallel to the path of the strip 1200 mm long and the transvers...
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